I can assure you that the game does not contain any viruses or malicious software. I just went to check for myself, as it's not something I have used before, and VirusTotal is a service which aggregates over 60 different antivirus services and scans the uploaded file with each one individually. In the case of Red Trees, only one of these 60+ services throws up a warning for potentially malicious software. This indicates a false positive. In the case of truly malicious software you would be looking for detection across the board from several different services.
False positives are not uncommon for games made in this engine (RPG Maker) and more broadly for all sorts of software being scanned through VirusTotal. VT even say so themselves and offer an entire paid service for developers looking to mitigate the risk of false positives.